Spotting a Scam can be a little tricky at first but as I have learned it gets easier over time. In the e-mail scams, You can spot one of these a mile away, They come under names you don't recognize and with subjects such as "Lottery Winner". There are ALOT of e-mail scams out there from people that are dying to threats against your life so Be Very Careful When Answering these.
On Craigslist there are several ongoing scams that could end with your personal information being stolen or sold. These Scams include (but not limited to) Jobs, Apartment Rentals, Personal Ads and I have even came across one that was trying to sell a puppy, These pelople claimed to be Missionaries working in Africa and wanted me to send them $100.00 to cover the shipping of the puppy back to the U.S., The Best Way to Spot a Scam is in the old saying "If it sounds too goo to be true, It probably is."
As far as all the work from home scams that seem to be sweeping th internet these days. The best advice I can give is "Google", That's right, Use Google to search for reviews, Put the name of the cash making system or the person that is offering the system and put the word SCAM behind it. This should bring up any claims of Fraud. Keep in mind though that with any product or service You will see people that Love it and People that Hate it. But you should be able to draw your own conclusion. I will be updating My Blog as much as Possible to Keep Everyone from being Scammed out of there Money or Personal Information.